Future Primals and potential implementation into lore.

[Eloah]

or utilize existing tribes that do not yet have a Primal, like the Amal'ja

I think you mean Mamool ja, the Amalj'aa have Ifrit as their Primal.

[LineageRazor]

I think you mean Mamool ja, the Amalj'aa have Ifrit as their Primal.

Yes, meant Mamool Ja, thank you for the correction! Also, can't believe I forgot about Shiva, probably the most prominent of the human-summoned Primals...

[Enkidoh]

The "beast tribes are the only ones who summon primals" premise has gotten very stale and predictable (same pattern for three expansions).

The thing is, it was pretty much stated since even back in 1.0 that the beast tribes were not the only ones capable of summoning Primals - Ifrit outright told you that in 1.0 to the point of making the player and their Path Companion swear to him that they will never summon "another" themselves - and in ARR's original main scenario there was that whole thing with the Ascians stirring up trouble with Ala Mhigan refugees and telling them how to summon a Primal-version of Rhalgr (needless to say, luckily we got there first and stopped them before they could do so).

So it's pretty clear that from the beginning it was shown and ultimately proven that any sentient race has the potential to summon a Primal, as that gets to the crux of what a Primal really is - they're a thoughtform, an idea or image given a will and a physical form of it's own through enormous quantities of aether and equally enormous amounts of prayer and devotion.

Either way, it's well and truly clear now that any race with a strong enough desire can summon, it's just that the Ascians were favouring the beastmen over the other races to do so until recently, probably because the beastmen were putdown and mostly shunned by the citystates as monsters, and thus more easily manipulated and willing to unleash a mind-warping, aether-consuming monster on Hydaelyn. Weak minds and all that.